I’ve been playing around with a 1/8″ end mill mostly. I just wanted to try some carving. I figured in foam it would be ok for testing. I’ll take a look at the belt attachment points tomorrow to see if I can figure that out, and I’ll slow things way down to see if that resolves the issue. I just don’t understand how trying to move too fast could cause the z to go too far up, or the xy to cut a perfect circular arc through the center of my workpiece on a mid-depth pass. I’ll take a look at your tutorials again for better rates to start with. Again, I really appreciate you taking the time to set me on the right path. You are awesome.